persistence

在使用Play2开发的时候,出现以下异常 javax.persistence.PersistenceException: ManyToMany bean [email protected] does not have an Id value. at com.avaje.ebeaninternal.server.persist.DefaultPersister.saveAssocManyIntersection(DefaultPersister.java:1045) at com.a

No matter what kind of persistence through technology, must access the database via the data connection, in the Spring, the data connection is obtained through the data source. In previous applications, the data source Web application server is gener

1 What is a transaction transaction (Transaction) is likely to update the database access and data items in a variety of program execution unit (unit). Affairs usually advanced database manipulation language or programming language (such as SQL, C +

SSH is most companies realize JAVA development of a basic framework, the framework of the technology involved nothing more than spring, struts, hibernate. Which depending on the application, use a different persistence technologies for sustainable te

Services four major characteristics: atomicity, consistency, isolation, and durability. 1 atom of An atomic transaction or complete execution, or simply not executed. This means that each unit of work tasks must be performed correctly. If there is an

During this time a bit to write a persistence framework, and ultimately, the natural framework XML, custom XML tags naturally need, this time XSD into the learning areas. The concept of XSD DTD XML Schema is an alternative, it describes the structure

Original link: http://www.iteye.com/topic/295348 1 properties using Spring annotations to inject 1.1 How we use the annotations into the property before the class implementation: Java code public class UserManagerImpl implements UserManager { private

Original link: http://77857.blog.51cto.com/67857/157076 I. What is Java Transaction The usual notion that only matters related to the database. Affairs must be subject to ISO / IEC developed the ACID principle. ACID is atomic (atomicity), consistency

Java application and Hibernate running between the main interface. It is the abstract concept of a persistence service core abstract API classes. Session life cycle bound to a physical transaction (tansaction) above. (Long transactions might span mul

Using SpringDAO when using OpenJPA transaction error code (when not in use error-free transactions): org.apache.openjpa.persistence.TransactionRequiredException: Can only perform operation while a transaction is active. A very strange error, Google f

No matter what kind of persistence through technology, must access the database via the data connection, in the Spring, the data connection is obtained through the data source. In previous applications, the data source is usually provided by the Web

[Original] path http://www.infoq.com/cn/articles/tq-why-choose-redis Many NoSQL flourishing, how to choose the last few years, a lot of emerging industry a variety of NoSQL products, how to correctly use these products good to maximize its strengths,

As systems become increasingly large, continuous and SOA-based modular, your system may be scattered in different machines, this time, your original single local transaction may have been unable to meet your needs, you may want to cross-system Cross

java concluded a transaction, what is the Java Transaction usual idea that the only database-related matters. Affairs must be subject to ISO / IEC developed the ACID principle. ACID is atomic (atomicity), consistency (consistency), isolation (isolati

Database transaction: Service: Logical unit of work, including an up statement, either all succeed or all fail, To commit to ending persistent change or revoke rollback operation ACID properties: Atomic (atomicity): The whole transaction as a single

getHibernateTemplate have a good package of some basic ways you can go directly to the use, that is, template Well, The getSession just get a data factory of the session, then most of the methods need to write, add hql statement, then execute the que

Transaction (Transaction) is to access and update the database in a variety of possible data items of a program execution unit (unit). Affairs are usually controlled by the language or advanced database programming language (such as SQL, C + + or Jav

Four basic properties (ACID) 1. Atomicity (Atomicity) Operation or transaction contains all or do not do the whole (all or none). (2) consistency (consistency) In the transaction data in a consistent state before the start of the transaction after th

The concept of transaction Transaction (Transaction) constitute a single logical unit of work sequence of database operations. The operation is a unified whole, Or all of the successful implementation (implementation writes the results to physical da

Affairs of the four properties: atomicity (atomicity), consistency (consistency), isolation (isolation) and persistence (durability). 1 atomic (Atomic) The most important principle, the principle is the most easy to understand. All methods are transa

Transaction (Transaction) is to access and update the database in a variety of possible data items of a program execution unit (unit). Affairs are usually controlled by the language or advanced database programming language (such as SQL, C + + or Jav

100kb just with a small text file, with 1000 cycles, in my books, and for redis (via redis-py), mongodb (via py-mongo) and ZODB (Zope database, OODB, direct use of key-value model not dependent on other data structures) for small-scale writing and re

There are a simulation of multi-tree table tree is structured as follows (the table does not contain foreign key, that parent is not a foreign key pointing to its own id): Field Type Null Key id int (11) NO PRI name varchar (30) YES parent int (11) Y

Article Keywords: Java Embedded Development DB data address book address book mini-text database records data Download (small programs lost by patients on the code.google): http://code.google.com/p/greenvm/downloads/list LMini is Loonframework one of

Data persistence popular talk is to save data to disk, guaranteed not to lose data because of power outages and other factors. redis often need to synchronize the data in memory to disk to ensure persistence. redis persistence supports two methods fo

[Transfer] Download (small programs lost by patients on the code.google): http://code.google.com/p/greenvm/downloads/list LMini is Loonframework one of the branch, it is a pure Java embedded only 55KB of text databases, the SQL statement is not suppo

Two-way and one-way distinction is not in their database, and in the loading direction. Such as Person and IdCard, one-way is an instance of Person can be loaded with IdCard IdCard, and two-way Person can only load IdCard, IdCard can have a Person in

iBatis is like Hibernate, JDO, EJB class of data persistence framework, it can be mapped to the SQL statement object and it is a lightweight framework and persistence API for persistence POJO.iBatis also with Hibernate, JDO different, because it Use

Original Address: Persistence of data on the redis some ideas Data persistence popular talk is to save data to disk, guaranteed not to lose data because of power outages and other factors. redis often need to synchronize the data in memory to disk to

session flush test: session flush focused on two things: 1. Clean up the cache; 2 Executive sql; session to flush under what circumstances 1. The default when a transaction commits; 2 shows the call flush; 3 before executing the query, such as: itera

from: http://zh.wikipedia.org/wiki/ACID ACID, refers to the database management system (DBMS) in the firm has four properties: atomicity (Atomicity), consistency (Consistency), isolation (Isolation, also known as independent), persistent (Durability)

memcached and redis expire the set command has arguments, you can set the key's expiration time. However, redis is a data persistence can be the key-value database, it is still the key expiration policies and memcached different. Order, order as foll

Atomic (atomicity): composed of transaction statements form a logical unit, not only perform part of it. Consistency (consistency): before and after implementation of the transaction, the database is consistent (database data integrity constraints) I

A simple one to one contact one of two classes annotated with the @ OnetoOne Error: Exception in thread "main" java.lang.NoSuchMethodError: javax.persistence.OneToOne.orphanRemoval () Z at org.hibernate.cfg.AnnotationBinder.processElementAnnotat

Before using the JPA implementation is toplink, now changed to hibernate, so you want to modify the persistence.xml file, there are two different configurations, and in the EE and SE environment environmental following below have not the same, anothe

Quote from: http://www.douban.com/note/122507891/ From the last release beansdb-0.3.0 has been another year. After a year of online operation of temper, it has been improving, and now have a very big change, briefly describe below: Completely abandon

Today participated in Taobao iDataForum, gain a lot. Details of the PPT can be made ​​over time on the official website on. Topic 1: the changing structure of Taobao. Taobao this topic in recent years mainly about some of the problems facing the data